Hey Bazza, started this thread as I can't attach the manual in PMs.The MCII is, as you know, a cab simulator. Have a good read of the manual attached. It will accept line level inputs e.g. your MP-1 outs or power amp speaker outs BUT you have to have your speakers connected to the amp as well so the amp has a speaker load if you do it this way. These were designed for either recording or live DI so you didn't have to use mics on the speakers.So for your setup, try MP-1 A&B outs > MCII in, MCII outs (which are line level) to studio monitors. This will make your MP-1 sound like micked speaker cabs in the studio monitors. The MCII outs could be plugged in to your DAW inputs (so you can record it), there are 2 outs per channel, one is line level, the 2 XLRs are mic level (to plug into mixer channels/stage box). The 2 MCII inputs have a "pass through", this is so you can use it before your stereo power amp/cabs. The pass through outs are hard wired to the MCII inputs, so in the above set up, the MP-1 outs will go to the MCII and you can use the pass through outs to plug into a stereo poweramp/cabs (like normal), and the MCII outs will have line (or mic) level cab simmed signal for DI into mixer (live or recording) or into a DAW input for your computer.